Realization of a classical Ruddlesden Popper type bilayer nickelate in Sr3Ni2−xAlxO7−δ with unusual Ni4+

IF 5.4 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Quantum Materials Pub Date : 2024-11-22 DOI:10.1038/s41535-024-00708-5

Hasan Yilmaz, Kathrin Küster, Ulrich Starke, Oliver Clemens, Masahiko Isobe, Pascal Puphal

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Abstract

The discovery of 80 K superconductivity in bilayer La₃Ni₂O₇ at pressures greater than 14 GPa presents a unique opportunity to study a novel class of high-temperature superconductors. Therefore, other bilayer nickelates following the classical (T⁴⁺) Ruddlesden-Popper (RP) series of Sr₃Ni₂O₇ would present an interesting new candidate. In this work, we study the stabilization of RP n = 2 phase in Sr₃Ni_2−xAl_xO_7−δ, via floating zone growth of crystals. With powder and single-crystal XRD, we study the stability range of the RP-type phase. Our Thermogravimetric Analysis (TGA), X-ray photoelectron spectroscopy (XPS) and gas extraction studies reveal a remarkably high oxidation state of Ni⁴⁺ stabilized by chemical strain from Al. The obtained black crystals are insulating in transport and show a magnetic transition around 12 K.

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在 Sr3Ni2-xAlxO7-δ 中实现具有不寻常 Ni4+ 的经典 Ruddlesden Popper 型双层镍酸盐

在压力大于 14 GPa 的双层 La3Ni2O7 中发现 80 K 超导电性为研究一类新型高温超导体提供了一个独特的机会。因此，继 Sr3Ni2O7 的经典 (T4+) Ruddlesden-Popper (RP) 系列之后的其他双层镍酸盐将是一个有趣的新候选材料。在这项研究中，我们通过晶体的浮区生长，研究了 Sr3Ni2-xAlxO7-δ 中 RP n = 2 相的稳定问题。通过粉末和单晶 XRD，我们研究了 RP 型相的稳定范围。我们的热重分析（TGA）、X 射线光电子能谱（XPS）和气体萃取研究显示，Ni4+ 的氧化态非常高，并通过来自 Al 的化学应变而得到稳定。获得的黑色晶体在传输过程中是绝缘的，并在 12 K 左右出现磁转变。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.